NemesisNG Posted February 12 Share Posted February 12 Been using Prestashop for a number of year now and upgrading is always a difficult task. Using a purchased theme which never retains any settings is the main problem, but I always just have to spend days setting it all up again. I've tried a great number of times to upgrade from 8.2.1 to 9 and it never fully works. First main issues were during the upgrade process itself it was failing half way through and ending in an error 500, but always related to a module from the theme I'm using. So I updated the theme to an apparent version 9 compatible version, but that made no difference. I then removed the theme totally and every module associated with it, the upgrade then for the first time completed, but now in the admin if I click on the Module tab and Module Manager I just get a blank white page, so there's still something wrong. Why is it so difficult to ever upgrade this software without some major issues? Link to comment Share on other sites More sharing options...
JBW Posted February 12 Share Posted February 12 You need to deactivate all (non-native) modules by renaming their folders on the server as even deactivates modules will be initiated when opening e..g module manager. By renaming them one-by-one you will find the incompatible ones. Before any upgrade you have the ensure that all modules and the theme are updated to new compatible version. 44 minutes ago, NemesisNG said: Why is it so difficult to ever upgrade this software without some major issues? In my experience 95% of the upgrade failures are caused by external modules or wrong server settings (e.g. PHP versions) 1 Link to comment Share on other sites More sharing options...
ComGrafPL Posted February 12 Share Posted February 12 1 hour ago, NemesisNG said: Been using Prestashop for a number of year now and upgrading is always a difficult task. Using a purchased theme which never retains any settings is the main problem, but I always just have to spend days setting it all up again. I've tried a great number of times to upgrade from 8.2.1 to 9 and it never fully works. First main issues were during the upgrade process itself it was failing half way through and ending in an error 500, but always related to a module from the theme I'm using. So I updated the theme to an apparent version 9 compatible version, but that made no difference. I then removed the theme totally and every module associated with it, the upgrade then for the first time completed, but now in the admin if I click on the Module tab and Module Manager I just get a blank white page, so there's still something wrong. Why is it so difficult to ever upgrade this software without some major issues? Easier is same as it was with 1.7 - 8, create clean installation and do the data migration, with updated theme, modules. Link to comment Share on other sites More sharing options...
BenoitAdam Posted February 16 Share Posted February 16 (edited) I've never did use the official plugin, just Migrationpro on a clean new shop I really wonder when you should change the PHP version. I guess you NEED to use PHP 8.1 to do the migration since it's the only version that are supported by both And yes of course disable themes & modules like the other said Edited February 16 by BenoitAdam (see edit history) Link to comment Share on other sites More sharing options...
NemesisNG Posted February 16 Author Share Posted February 16 Well I've tried everything now, removed all non standard modules, there was only 5 I think anyway, and removed our theme and all files / folder, will them complete the upgrade but can't open Module Manager or some other parts of the admin console. Tried a fresh file copy of 8 and pointed to the existing database and then upgrade, same issue. Tried a fresh copy of 9 and then exported the products and customers etc etc from the old 8 shop and import to the clean 9. but that just doesn't map over and was a total mess. Looks like MigrationPro might be the answer, but it's £150 although it will give me a clean 9 install and the data moved over to move forward from. Thanks all. Link to comment Share on other sites More sharing options...
BenoitAdam Posted February 16 Share Posted February 16 yeah or maybe wait for Prestashop 9.1 You still can use Prestashop 8.2 for 3/6 months at least I guess Link to comment Share on other sites More sharing options...
Ray UK Posted February 18 Share Posted February 18 On 2/16/2026 at 6:14 PM, NemesisNG said: Well I've tried everything now, removed all non standard modules, there was only 5 I think anyway, and removed our theme and all files / folder, will them complete the upgrade but can't open Module Manager or some other parts of the admin console. Tried a fresh file copy of 8 and pointed to the existing database and then upgrade, same issue. Tried a fresh copy of 9 and then exported the products and customers etc etc from the old 8 shop and import to the clean 9. but that just doesn't map over and was a total mess. Looks like MigrationPro might be the answer, but it's £150 although it will give me a clean 9 install and the data moved over to move forward from. Thanks all. Do a clean 9 install and copy the data by using this excellent free program. Link to comment Share on other sites More sharing options...
BenoitAdam Posted February 18 Share Posted February 18 Can always try, I'm curious if it works Develloping such stuff takes time & dedication & accuracy, that's why migrationpro isn't free. It's one of the few paid plugin I make my client pay (this and a theme or theme builder). As a freelance it's always touchy to make people pay plugins. Tested from 1.7 => 8.2 and 1.7 => 9.0 both worked flawlessly Link to comment Share on other sites More sharing options...
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